I’m not sure the code will help too much, but here are the relevant code
fragments. I’m using a hand crafted VB.net wrapper which explains some of the
syntax
Private WGS84SRS As New OGRSpatialReference ' Coordinate system in WGS84
Private MapSRS As OGRSpatialReference ' Coordinate system of map
Private ctWGS84toMap As OGRCoordinateTransformation ' Coordinate
transform from WGS84 to map
With WGS84SRS
GDALError = .SetProjCS("WGS84 Datum")
Debug.Assert(GDALError = OGRError.OGRERR_NONE, GetLastErrorMsg())
GDALError = .SetWellKnownGeogCS("WGS84") ' Define WGS84 coordinate
system
Debug.Assert(GDALError = OGRError.OGRERR_NONE, GetLastErrorMsg())
End With
With MapSRS
GDALError = .SetProjCS("Map coordinate system")
Debug.Assert(GDALError = OGRError.OGRERR_NONE, GetLastErrorMsg())
GDALError = .ImportFromEPSG(3577)
Debug.Assert(GDALError = OGRError.OGRERR_NONE, GetLastErrorMsg())
End With
ctWGS84toMap = GDAL.CreateCoordinateTransformation(WGS84SRS, MapSRS) '
Create a coordinate transformation - WGS84 to map
Debug.Assert(ctWGS84toMap IsNot Nothing, GetLastErrorMsg())
Marc,
Can you provide the code leading to the error?
On Tue, Oct 18, 2011 at 1:21 PM, Marc Hillman <[email protected]> wrote:
I have a GIS database, and all data is stored in WGS84 datum. I have developed
an application using GDAL, and I now need to translate my WGS84 coordinates to
several different datums, depending what map is loaded. I seem to be going
around in circles, and need a nudge in the right direction. I am defining an
OGRSpatialReference for each datum (WGS84 and current map) and then attempting
to create an OGRCoordinateTransformation for the transformation.. This last
step fails with a PROJ.4 error (“No PROJ.4 translation for destination SRS,
coordinate transformation initialization failed”
My question is - Do I need PROJ.4 to do the translation? Can I not just use
ImportFromWKT to define my OGRSpatialReference? If so, is there a nice canned
list of all the WKT somewhere? I’m keen to avoid PROJ.4 if possible as I’m not
sure I can build it.
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Best regards,
Chaitanya kumar CH.
+91-9494447584
17.2416N 80.1426E
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